from ttlcache import FakeClock, TTLCache


def test_get_refreshes_recency():
    clock = FakeClock()
    cache = TTLCache(maxsize=2, ttl=10.0, clock=clock)
    cache["a"] = 1
    cache["b"] = 2
    assert cache["a"] == 1
    cache["c"] = 3
    assert "a" in cache
    assert "b" not in cache


def test_overwrite_refreshes_recency():
    clock = FakeClock()
    cache = TTLCache(maxsize=2, ttl=10.0, clock=clock)
    cache["a"] = 1
    cache["b"] = 2
    cache["a"] = 9
    cache["c"] = 3
    assert cache["a"] == 9
    assert "b" not in cache


def test_setdefault_refreshes_recency():
    clock = FakeClock()
    cache = TTLCache(maxsize=2, ttl=10.0, clock=clock)
    cache["a"] = 1
    cache["b"] = 2
    assert cache.setdefault("a", lambda: 99) == 1
    cache["c"] = 3
    assert "a" in cache
    assert "b" not in cache


def test_len_ignores_expired_entries():
    clock = FakeClock()
    cache = TTLCache(maxsize=4, ttl=10.0, clock=clock)
    cache["a"] = 1
    clock.advance(5)
    cache["b"] = 2
    clock.advance(6)
    assert len(cache) == 1
    assert "a" not in cache
    assert "b" in cache


def test_items_reports_least_recently_used_first():
    clock = FakeClock()
    cache = TTLCache(maxsize=3, ttl=10.0, clock=clock)
    cache["a"] = 1
    cache["b"] = 2
    assert cache["a"] == 1
    assert list(cache.items()) == [("b", 2), ("a", 1)]